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<title>class Rinda::RingServer - rinda: Ruby Standard Library Documentation</title>


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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-do_reply">#do_reply</a>
    <li ><a href="#method-i-do_write">#do_write</a>
    <li ><a href="#method-i-make_socket">#make_socket</a>
    <li ><a href="#method-i-reply_service">#reply_service</a>
    <li ><a href="#method-i-shutdown">#shutdown</a>
    <li ><a href="#method-i-write_services">#write_services</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-Rinda::RingServer">
    <h1 id="class-Rinda::RingServer" class="class">
      class Rinda::RingServer
    </h1>

    <section class="description">
    
<p>A <a href="RingServer.html"><code>RingServer</code></a> allows a <a href="TupleSpace.html"><code>Rinda::TupleSpace</code></a> to be located via UDP broadcasts. Default service location uses the following steps:</p>
<ol><li>
<p>A <a href="RingServer.html"><code>RingServer</code></a> begins listening on the network broadcast UDP address.</p>
</li><li>
<p>A <a href="RingFinger.html"><code>RingFinger</code></a> sends a UDP packet containing the DRb URI where it will listen for a reply.</p>
</li><li>
<p>The <a href="RingServer.html"><code>RingServer</code></a> receives the UDP packet and connects back to the provided DRb URI with the DRb service.</p>
</li></ol>

<p>A <a href="RingServer.html"><code>RingServer</code></a> requires a TupleSpace:</p>

<pre class="ruby"><span class="ruby-identifier">ts</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">TupleSpace</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">rs</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">RingServer</span>.<span class="ruby-identifier">new</span>
</pre>

<p><a href="RingServer.html"><code>RingServer</code></a> can also listen on multicast addresses for announcements.  This allows multiple RingServers to run on the same host.  To use network broadcast and multicast:</p>

<pre class="ruby"><span class="ruby-identifier">ts</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">TupleSpace</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">rs</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">RingServer</span>.<span class="ruby-identifier">new</span> <span class="ruby-identifier">ts</span>, <span class="ruby-node">%w[Socket::INADDR_ANY, 239.0.0.1 ff02::1]</span>
</pre>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(ts, addresses=[Socket::INADDR_ANY], port=Ring_PORT)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Advertises <code>ts</code> on the given <code>addresses</code> at <code>port</code>.</p>

<p>If <code>addresses</code> is omitted only the UDP broadcast address is used.</p>

<p><code>addresses</code> can contain multiple addresses.  If a multicast address is given in <code>addresses</code> then the <a href="RingServer.html"><code>RingServer</code></a> will listen for multicast queries.</p>

<p>If you use IPv4 multicast you may need to set an address of the inbound interface which joins a multicast group.</p>

<pre class="ruby"><span class="ruby-identifier">ts</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">TupleSpace</span>.<span class="ruby-identifier">new</span>
<span class="ruby-identifier">rs</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">RingServer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">ts</span>, [[<span class="ruby-string">&#39;239.0.0.1&#39;</span>, <span class="ruby-string">&#39;9.5.1.1&#39;</span>]])
</pre>

<p>You can set addresses as an Array Object.  The first element of the Array is a multicast address and the second is an inbound interface address.  If the second is omitted then ‘0.0.0.0’ is used.</p>

<p>If you use IPv6 multicast you may need to set both the local interface address and the inbound interface index:</p>

<pre class="ruby"><span class="ruby-identifier">rs</span> = <span class="ruby-constant">Rinda</span><span class="ruby-operator">::</span><span class="ruby-constant">RingServer</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">ts</span>, [[<span class="ruby-string">&#39;ff02::1&#39;</span>, <span class="ruby-string">&#39;::1&#39;</span>, <span class="ruby-value">1</span>]])
</pre>

<p>The first element is a multicast address and the second is an inbound interface address.  The third is an inbound interface index.</p>

<p>At this time there is no easy way to get an interface index by name.</p>

<p>If the second is omitted then ‘::1’ is used. If the third is omitted then 0 (default interface) is used.</p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 94</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">ts</span>, <span class="ruby-identifier">addresses</span>=[<span class="ruby-constant">Socket</span><span class="ruby-operator">::</span><span class="ruby-constant">INADDR_ANY</span>], <span class="ruby-identifier">port</span>=<span class="ruby-constant">Ring_PORT</span>)
  <span class="ruby-ivar">@port</span> = <span class="ruby-identifier">port</span>

  <span class="ruby-keyword">if</span> <span class="ruby-constant">Integer</span> <span class="ruby-operator">===</span> <span class="ruby-identifier">addresses</span> <span class="ruby-keyword">then</span>
    <span class="ruby-identifier">addresses</span>, <span class="ruby-ivar">@port</span> = [<span class="ruby-constant">Socket</span><span class="ruby-operator">::</span><span class="ruby-constant">INADDR_ANY</span>], <span class="ruby-identifier">addresses</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@renewer</span> = <span class="ruby-constant">Renewer</span>.<span class="ruby-identifier">new</span>

  <span class="ruby-ivar">@ts</span> = <span class="ruby-identifier">ts</span>
  <span class="ruby-ivar">@sockets</span> = []
  <span class="ruby-identifier">addresses</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">address</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">if</span> <span class="ruby-constant">Array</span> <span class="ruby-operator">===</span> <span class="ruby-identifier">address</span>
      <span class="ruby-identifier">make_socket</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">address</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">make_socket</span>(<span class="ruby-identifier">address</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@w_services</span> = <span class="ruby-identifier">write_services</span>
  <span class="ruby-ivar">@r_service</span>  = <span class="ruby-identifier">reply_service</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-do_reply" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">do_reply</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Pulls lookup tuples out of the <a href="TupleSpace.html"><code>TupleSpace</code></a> and sends their DRb object the address of the local <a href="TupleSpace.html"><code>TupleSpace</code></a>.</p>

                              <div class="method-source-code" id="do_reply-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 218</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">do_reply</span>
  <span class="ruby-identifier">tuple</span> = <span class="ruby-ivar">@ts</span>.<span class="ruby-identifier">take</span>([<span class="ruby-value">:lookup_ring</span>, <span class="ruby-keyword">nil</span>], <span class="ruby-ivar">@renewer</span>)
  <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span> { <span class="ruby-identifier">tuple</span>[<span class="ruby-value">1</span>].<span class="ruby-identifier">call</span>(<span class="ruby-ivar">@ts</span>) <span class="ruby-keyword">rescue</span> <span class="ruby-keyword">nil</span>}
<span class="ruby-keyword">rescue</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-do_write" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">do_write</span><span
                                class="method-args">(msg)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Extracts the response URI from <code>msg</code> and adds it to <a href="TupleSpace.html"><code>TupleSpace</code></a> where it will be picked up by <code>reply_service</code> for notification.</p>

                              <div class="method-source-code" id="do_write-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 193</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">do_write</span>(<span class="ruby-identifier">msg</span>)
  <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span>
    <span class="ruby-keyword">begin</span>
      <span class="ruby-identifier">tuple</span>, <span class="ruby-identifier">sec</span> = <span class="ruby-constant">Marshal</span>.<span class="ruby-identifier">load</span>(<span class="ruby-identifier">msg</span>)
      <span class="ruby-ivar">@ts</span>.<span class="ruby-identifier">write</span>(<span class="ruby-identifier">tuple</span>, <span class="ruby-identifier">sec</span>)
    <span class="ruby-keyword">rescue</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-make_socket" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">make_socket</span><span
                                class="method-args">(address, interface_address=nil, multicast_interface=0)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a socket at <code>address</code></p>

<p>If <code>address</code> is multicast address then <code>interface_address</code> and <code>multicast_interface</code> can be set as optional.</p>

<p>A created socket is bound to <code>interface_address</code>.  If you use IPv4 multicast then the interface of <code>interface_address</code> is used as the inbound interface.  If <code>interface_address</code> is omitted or nil then ‘0.0.0.0’ or ‘::1’ is used.</p>

<p>If you use IPv6 multicast then <code>multicast_interface</code> is used as the inbound interface.  <code>multicast_interface</code> is a network interface index. If <code>multicast_interface</code> is omitted then 0 (default interface) is used.</p>

                              <div class="method-source-code" id="make_socket-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 132</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">make_socket</span>(<span class="ruby-identifier">address</span>, <span class="ruby-identifier">interface_address</span>=<span class="ruby-keyword">nil</span>, <span class="ruby-identifier">multicast_interface</span>=<span class="ruby-value">0</span>)
  <span class="ruby-identifier">addrinfo</span> = <span class="ruby-constant">Addrinfo</span>.<span class="ruby-identifier">udp</span>(<span class="ruby-identifier">address</span>, <span class="ruby-ivar">@port</span>)

  <span class="ruby-identifier">socket</span> = <span class="ruby-constant">Socket</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">pfamily</span>, <span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">socktype</span>,
                      <span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">protocol</span>)

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">ipv4_multicast?</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">ipv6_multicast?</span> <span class="ruby-keyword">then</span>
    <span class="ruby-keyword">if</span> <span class="ruby-constant">Socket</span>.<span class="ruby-identifier">const_defined?</span>(<span class="ruby-value">:SO_REUSEPORT</span>) <span class="ruby-keyword">then</span>
      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">setsockopt</span>(<span class="ruby-value">:SOCKET</span>, <span class="ruby-value">:SO_REUSEPORT</span>, <span class="ruby-keyword">true</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">setsockopt</span>(<span class="ruby-value">:SOCKET</span>, <span class="ruby-value">:SO_REUSEADDR</span>, <span class="ruby-keyword">true</span>)
    <span class="ruby-keyword">end</span>

    <span class="ruby-keyword">if</span> <span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">ipv4_multicast?</span> <span class="ruby-keyword">then</span>
      <span class="ruby-identifier">interface_address</span> = <span class="ruby-string">&#39;0.0.0.0&#39;</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">interface_address</span>.<span class="ruby-identifier">nil?</span>
      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">bind</span>(<span class="ruby-constant">Addrinfo</span>.<span class="ruby-identifier">udp</span>(<span class="ruby-identifier">interface_address</span>, <span class="ruby-ivar">@port</span>))

      <span class="ruby-identifier">mreq</span> = <span class="ruby-constant">IPAddr</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">ip_address</span>).<span class="ruby-identifier">hton</span> <span class="ruby-operator">+</span>
        <span class="ruby-constant">IPAddr</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">interface_address</span>).<span class="ruby-identifier">hton</span>

      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">setsockopt</span>(<span class="ruby-value">:IPPROTO_IP</span>, <span class="ruby-value">:IP_ADD_MEMBERSHIP</span>, <span class="ruby-identifier">mreq</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">interface_address</span> = <span class="ruby-string">&#39;::1&#39;</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">interface_address</span>.<span class="ruby-identifier">nil?</span>
      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">bind</span>(<span class="ruby-constant">Addrinfo</span>.<span class="ruby-identifier">udp</span>(<span class="ruby-identifier">interface_address</span>, <span class="ruby-ivar">@port</span>))

      <span class="ruby-identifier">mreq</span> = <span class="ruby-constant">IPAddr</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">addrinfo</span>.<span class="ruby-identifier">ip_address</span>).<span class="ruby-identifier">hton</span> <span class="ruby-operator">+</span>
        [<span class="ruby-identifier">multicast_interface</span>].<span class="ruby-identifier">pack</span>(<span class="ruby-string">&#39;I&#39;</span>)

      <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">setsockopt</span>(<span class="ruby-value">:IPPROTO_IPV6</span>, <span class="ruby-value">:IPV6_JOIN_GROUP</span>, <span class="ruby-identifier">mreq</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">bind</span>(<span class="ruby-identifier">addrinfo</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">socket</span>
<span class="ruby-keyword">rescue</span>
  <span class="ruby-identifier">socket</span> = <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">socket</span>
  <span class="ruby-identifier">raise</span>
<span class="ruby-keyword">ensure</span>
  <span class="ruby-ivar">@sockets</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">socket</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">socket</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-reply_service" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">reply_service</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a thread that notifies waiting clients from the <a href="TupleSpace.html"><code>TupleSpace</code></a>.</p>

                              <div class="method-source-code" id="reply_service-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 206</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">reply_service</span>
  <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span>
    <span class="ruby-identifier">loop</span> <span class="ruby-keyword">do</span>
      <span class="ruby-identifier">do_reply</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-shutdown" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">shutdown</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Shuts down the <a href="RingServer.html"><code>RingServer</code></a></p>

                              <div class="method-source-code" id="shutdown-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 227</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">shutdown</span>
  <span class="ruby-ivar">@renewer</span>.<span class="ruby-identifier">renew</span> = <span class="ruby-keyword">false</span>

  <span class="ruby-ivar">@w_services</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">thread</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">thread</span>.<span class="ruby-identifier">kill</span>
    <span class="ruby-identifier">thread</span>.<span class="ruby-identifier">join</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@sockets</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">socket</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">close</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@r_service</span>.<span class="ruby-identifier">kill</span>
  <span class="ruby-ivar">@r_service</span>.<span class="ruby-identifier">join</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write_services" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_services</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates threads that pick up UDP packets and passes them to <a href="RingServer.html#method-i-do_write"><code>do_write</code></a> for decoding.</p>

                              <div class="method-source-code" id="write_services-source">
            <pre><span class="ruby-comment"># File rinda/ring.rb, line 178</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_services</span>
  <span class="ruby-ivar">@sockets</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">s</span><span class="ruby-operator">|</span>
    <span class="ruby-constant">Thread</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">s</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">socket</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">loop</span> <span class="ruby-keyword">do</span>
        <span class="ruby-identifier">msg</span> = <span class="ruby-identifier">socket</span>.<span class="ruby-identifier">recv</span>(<span class="ruby-value">1024</span>)
        <span class="ruby-identifier">do_write</span>(<span class="ruby-identifier">msg</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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